Grease gun



Nov. 3, 1931. E. H. DAMMEYER 1,829,789

GREASE GUN Filed Dec. 30, 1929 7 "VWF INVENTOR.

imamew 8f ma 'BY EMMA-A A TTORNE Y.

' 'Y Patented Nov.v3, y1931 `rlim'vviiv.;It;:onisylnsfrmria:a-, oF FORT WAYNE iNnIANA ennAsEGUN f lThe invention relates (to grease". guns *for usein `applying grease to ,var1ous`mach1ne parts suchas motor vehicles.

. The vobject ofthe' invention vis lto providev "'5`a simpleand efficient: power driven' grease 'gun that is readily held in thehandv and controlled thereby; .v 'j K l f Another object isto provide a power driven Vgrease gun with means whichthe grease 10 dischargingjmechanism may be'jretracted eitherby the powergor'hyhand. n .Other bjeots'will appearhereinafter;V4 L

" The invention consistsof the nvelfcom-v I n binationand arrangement of parts hereinafter 15 described` and illustrated'in the drawings, in

whichdrawings v Y "jlFigure i1 is ajsideelevational view of "a fglease gun embodyingthe invention; Fig. 2 'i an enlarged cro-ss sectionfonline' 12e-2 of Fig. -1`!20"1; Fig. 3 a side 'elevatina :partly insection of the clutchmechanismof the.v plunger ope yeratingdevices; Fig. "an elevationaljview 'fof thevclut'ch sleeverbe'aring'; ylcTi'gQf"ajside 1 Felevational viewl of the'clutchv sleeve/Fig. 55125. 6a plan view of the clutch jaws, r'and Fig, 'Zanfend view 'of'said clutch jaws. i

In` the illustrative embodiment ofthe' invention; lrepresents aVt main frame upon which is mounted a .suita'bleele'ctric motor2 through the frame, 4 is "aflziandle kksecured to fthe yframe and having vavs'w'i'tch' thereinthe "Operating arm ,of Whch projectsffrm the handle where it isvconvenient for operation '5335 by one ofthe ingersof the handthatgrasps rthe handle. Electrical currentis. supplied ythrough the wires''that extend i'ntethejhanand tothe motor 2.", r lwo worms 7, 8. are

vdle and are connected tothe switchfterminals securedV towa ysleeve that is lon itudinally-slidable on'` the motorV Vshaft 3; notched 'sleeve 8a' is-"securedto fthe shaft 3 below the .worm 8 and a'tapered lug -8b on the'worm' 8 is-adapted to engage the "45fsaid notch for locking-thejworm tothe sleeve;

` freely extends. A

A appiiatioalalea recenter 3o, 1929. fserialno. 4152347. s f;

and a notched sleeve 7 a is secured to the shaft Y' 3 abovethel worm 7 a tapered lug on said wormy being adapted to engage in the notch in sleeve 7 'a to lock the worm 7 'to the 'shaft 3. .c The worms are threaded right and letti- 3450 spectively and either ma be caused to engage a gear 9 secured to a sha 10 that is revolubly mounted on the main frame. A worm 11 is securedtov or formed on they shaft 10 and meshes with a'g'ear 12 formed on a sleeve 13 55 through whichvthe threaded plunger rod 14 ring 15 bears Vat one end on the sleeve 13 andy at its other end the spring bears against the hearing 16 for the.

vrod 14. A clutch member is engaged on the 60 opposite yend orthesleeve'vl and consists .of two' internally threadedy semi-cylindrical jaws 17 Vheldtogether bythe pins 18 inserted i is recessed to'receive the. lugs 17El on the rear end of the sleeve 13whereby to engage the 70 jaws to the sleeve; t

- The opposite end of each jaw 17 is tapered and is adapted to be engaged by the clutch j v sleeve 21 when said sleeve is moved longitu- M H130 having its 1 shaft' 3 extending Ydownwardly dinally on the bearing 22 that supports it. 75

yThe clutch sleeve 21 opposed by the springs presis'esthe two j aws`17 toward each other "causing their linternalthreads 17b to vengage handle 4, carries a' fork 24 that is engaged `85 "in an annular groove 25 formed in the periphery ofthe clutch sleeve 21. By moving Vthe rod v23 inwardly the sleeve 21 is causedto engage the 'clutch 'jaws 17 and press themw towardleach other, the opposite movement of gagement and Vconsequent release of the jaws 1 17 from the rod 14.

I VAcollar 25l is loose VonY ing .zi-longitudinal slot 27 therein V.is pivoted f at-its lovver end tothe collar 25. A' notch 28 Yisalso formed in the link 26Which opens into' the slot' 27 in the link.r A stud orvscrevv` 29 projects fromV the main frame andy Yextends through ythe slot 27 in the link. -A spring 3() d Y is Secured'to-therame andtothelowerend vThe' :Spring eo "nofmniy raids falaise the "vv'orms7,- 8l inelevated position on'themoto'r i gear 9.,VA By depressing the link 26 fthe Worms aremoved downwardly On the' sliat't'vPa'""theV stud Vor screvv 29l eventually engaging inthe notch 28 at Which time1theworm'7`is in 'en 'Y aegee position 'and-thiewormv remains A, ,infengagementvvith'- the. gear 9. vllVormg7 1s l adepted Yto strive; the several gears "so that .the Y :plunger rod is" advanced, "Worin.-Sxbeingl adapted to 'caly {'link'fis Treadil -Qthejclutchsleeve"'orireversing the move*- Y. yinent'of the'plunger rd. n 3- ]f! .Sincetheclutcli members21 and`17 mustibe engagementtocause the plunger rodtorev 'gears and they, worm' 7v inte engagement-with i l Y, releases the plunger rod so thatitinay be re- .,tracted by hand Whendesired. e Y

fflfheinnerend of the cylinder is eXteriori klythreaded and the threads vthereon `engage Y :job .has been nished. A The operator at hand three `controls for .the device, namely:

Y v the'switchgthe-clutchand the link. Therefthe ,sleeve that'sup-jlease ofthelink is especiallyuseful When *ports the vvorms 7 and 8 and a link 26 hav# it is desiredtoj retract therplunger" a shortV handle on thefra'1ne," anV electric VV'motor' plunger in order a plunger Within the cylinder,` a rodfsecured t'fthe plunger and projecting'from one vend thereofb thro'ugh the frame, a'lclutch adapted to engage the rod,V and a train of gears and -Weins driven by the shafty and adapted, un-

der the ycontrol voef-the clutch, to cause the rod andplungerto reciprocate.

greasepgun comprisingga frame, a handleY 011 'the zfrmezi e115 :electric motor mounted onthe frameandhaving ashaft eX- tended into Lthe frame; a` Cylindergcarried by the Yframe5 a plunger grrwithin theV cylinder, a. threaded rod; securedto the plunger and projecting fromfthe vcylinderand through the frame,Y a revolubgle vrintern'a'lly'fthreaded sleeve c Y loosely ,metd 011 the' rbd; means t0' wie@ screw 29 andwhenk it is released thejspring@ thesleevethread's'to engage the threadsgonf movestheworm Sinto engagementyvithifthe .the rod, and'grneans having V connection with thev s hatfand vvith? thesleevefforfrotating thev Y As leeveto cause the .rodand plunger to vrecip- Y Lcylinder -removably `carried. by g theVv rame,

4rrod secured to vthefplungerand .projecting fromthe oylinderfa loose gear member rev" olllbly Amountedon afrod, a resilient. member opp osingflongitudin al Inovemvznt of the; gear Va -plunger'lvvithinitlie ycylinder,Qa threaded loo l f anfinternallythreaded boss 3 2. l'ormed'on,theI1f1e1nber in onefdirection', an vinternally *Y Y *..mainKf-rame'. AY plunger 330i.: suitable forni is attached to the inner-endl of the plunger rod ,14"that projectsV throughjanopening ,in

gztheiframel-landjinthe-annularstopll carried fby the frame; The` opposite Yo rjorWard end c 5v-0 ofj-lthe'cylinderiseXteri'OrIy threaded to rebefattached to the cylinder.

fW-j-Suitable plates- Will'be attachedlftofrthe ceive a Vcap orotherfclosure 35k.` The capisj fearssturd to freive 'al rljOZZllG-I ln" Figa-'l Y the noZzle'S-is held `inpositionbya washer i Various forms ofrcap's'and nozzles .Lframeoato cover the. open sides thereof so ,a as

theplunger; or a filled bylinde'r maybe quickly substituted .for 'a lcylinder that is. eX'- Y p 1 .j''u'haustedofits contents ibefore the particular.gg`

preferably eXteriorly of: the adjacent cover Y plateVY f a l1; :is

to enclose the severalgears, the linkbeing cylinder is hfrthesubstanceto be forced 'from it: by l threaded 'longitudinallysplt clutch sleeve f vvleesely kn iunted. onfthe .shaft fand?l cennected to .the gear, member, f-means'to cause 'theV threads fon the' clutch sleeve to engagefthe threads .on the altrai'nfofgears .and Y v:Wormshaying.connection withthe, gear member, VAtvvoWorms,[slidably `)mounted von Y the .shaft theitli'len dnerof the lattelvorms' bein-g reverse to-those onthe other', and means cylinderiremovably mounted on the frame,

a plungerg-infthef'cylinder, aV threaded rod secured tothe plun'ger and projecting from the cylinder and through theframe,` a gear- 'carrying i member-.revolubly :and jlooselyl mounted on theirodtvvoresiliently connected internally Y threaded semi-.circular members engagin the gear lcarryingmember and dis- ;Aposed a jacentjto the rod, a longitudinally slid'able sleeve adapted to engage the semicircular members and 'cause the threads 'thereof to engage the threaded rod; means to slide the said sleeve, and means having connection with the gear carrying member and adapted to be connected to the motor v shaft for rotating said semi-circular members and cause the plunger toA reciprocate. l In witness whereof I have hereunto subv scribed my name. v

- EDWIN H. DAMMEYER'. 

